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High-tenacity steel plate for ocean engineering and manufacturing method thereof

A marine engineering and high toughness technology, applied in the field of marine engineering steel, can solve the problems of high content and high production cost, and achieve the effect of less alloying elements, low cost and strong feasibility

Active Publication Date: 2012-07-04
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its Re>550MPa, Rm>670MPa, elongation>20%, -60°C impact energy>60J or 200J, Z-direction reduction of area>35%, but it adopts TMCP+ tempering process, and Cu, Cr, Mo, Ni content is higher, production cost is higher

Method used

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  • High-tenacity steel plate for ocean engineering and manufacturing method thereof
  • High-tenacity steel plate for ocean engineering and manufacturing method thereof
  • High-tenacity steel plate for ocean engineering and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The thickness of low-cost high-strength marine engineering steel plate is 30mm, and its chemical composition is: C 0.04%, Si0.24%, Mn1.52%, Alt0.034%, Nb0.048%, V0.052%, Ti0.015% , Mo0.33%, Ni0.3%, Cu0.21%, P0.01%, S0.0029%, and the rest are iron Fe and unavoidable impurities. The billet size is 300*2400*2700mm, the steel plate size is 30*2600*24900mm, and the segregation of the low-magnification inspection center of the cast billet is C-class 0.5. Table 1 is the controlled rolling and controlled cooling process parameters under this composition, and Table 2 is in the The mechanical properties obtained under the process parameters. Table 3 Aging impact performance and Z-direction performance of steel plates. attached figure 1 Rolling regulations for 30mm thick steel plate, attached figure 2 , attached image 3 And attached Figure 4 It is the microstructure of 30mm thick steel plate. It can be seen that the structure of the steel plate is mainly composed of massi...

Embodiment 2

[0056] The thickness of low-cost high-strength marine engineering steel plate is 50mm, and its chemical composition is: C 0.06%, Si0.18%, Mn1.49%, Alt0.039%, Nb0.046%, V0.05%, Ti0.014% , Mo0.36%, Cu0.22%, Ni0.4%, P0.009%, S0.0024%, and the rest are iron Fe and unavoidable impurities. The size of billet is 300*2400*3550mm, the size of steel plate is 50*2500*20448mm, the segregation of casting billet low-magnification inspection center is C class 0.5, table 4 is the controlled rolling and controlled cooling process parameters under this composition, table 5 is in this composition The mechanical properties obtained under the process parameters. Table 6 Aging impact performance and Z-direction performance of steel plates. Table 7 shows the results of the drop weight test on the steel plate. The measured non-plastic transition temperature TNDT of the 50mm thick steel plate is -60°C. Table 8 -40°C impact energy of welded joints when the line energy is 50kJ / cm. attached Figure 5...

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Abstract

The invention relates to a high-tenacity steel plate for ocean engineering and a manufacturing method thereof, belonging to the technical field of steel for ocean engineering. The high-tenacity steel plate comprises the following chemical compositions according to percentages by weight: 0.03-0.08% of C, 0.10-0.30% of Si, 1.0-1.60% of Mn, 0.03-0.04% of Alt, 0.03-0.06% of Nb, 0.05-0.09% of V, 0.010-0.02% of Ti, 0.1-0.4% of Mo, 0.1-0.4% of Ni, 0.1-0.4% of Cu, less than 0.01% of P, less than 0.005% of S, less than or equal to 0.12% of Nb+V+Ti, the rest of Fe and inevitable impurities. The low-temperature tenacity of the steel plate is ensured by adding few Ni and adopting a reasonable controlled rolling and cooling technology, thereby a thermal treatment technology is omitted, and the production cost is reduced; the obtained steel plate with 10-50mm has good strong plasticity, weldability and anti-lamellar tearing performance and excellent comprehensive mechanical performance such as drop weight and the like; and the high-tenacity steel plate is simple in technology and can be widely applied to key positions of permanent, self-elevating and semi-submersible type ocean platforms.

Description

technical field [0001] The invention belongs to the technical field of steel for marine engineering, and in particular relates to a high-toughness steel plate for marine engineering and a manufacturing method thereof, which have low cost, strong plasticity, excellent weldability, lamellar tear resistance, drop hammer and other comprehensive mechanical properties. Background technique [0002] As my country's demand for non-renewable resources such as oil continues to grow, the ocean has become the hope of meeting oil demand. The process of marine development has been accelerating, and the offshore oil and gas industry has sprung up, with an average annual growth rate of 32.3%, rapidly growing into a pillar industry of China's marine economy. Offshore oil is the focus of my country's energy strategy for the next 20 years. [0003] Since the development of oil and gas is advancing from the land to the shallow sea to the cold zone with a temperature of -40~-60°C, in order to e...

Claims

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Application Information

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IPC IPC(8): C22C38/16C21D8/02
Inventor 狄国标王彦锋麻庆申沈钦义杨永达姜中行杨春卫王文军王龙和张苏渊白学军何元春吴斌
Owner SHOUGANG CORPORATION
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